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Multiple sword of the divine on one champion cause the CD to be decreased further on kills.
How to replicate:
Purchase multiple SoTD and kill an enemy champion. The CD will be decreased by 50% as intended if you only own a single SoTD. However, if you own a second SoTD, the CD will be decreased to only 25% of it's total CD on champion kill. Not sure if this is intended on sword of the divine for sure.